general • Re: Needed info: How are GND and data lines pared in parallel I/O cables❓

Hello 0010 all,

On an old PC both serial and parallel ports were DB25, but you could typically distinguish them; the serial port was male and the parallel port was female. Later PCs just had the serial port as a DB9 (after all, the other pins were rarely - if ever - used).

For example (taken from https://www.minuszerodegrees.net/transf ... ts_old.jpg)
serial_ports_old.jpg

The original attempt was to use the MS-9150 with an Amstrad-Schneider PC, this, the quoted above (use link in quote for image) and the fact that Conrad delivered a DB-25 female to DB-25 male cable with the MS-9150 is possibly why it didn't work.

Because the MS-9150 has a male output connector the leftover connector on the cable suggested it needed a female recipient on the side of the PC.

By the way the cable is fully wired, twenty-five individual connections and a shielding, no interconnections between the different lines (I tested the cable with a buzzer, one on one all lines buzzed, no shorts between lines).

Can anyone tell, is there chance of the MS-9150 output still working after having it plugged in to the wrong connector at the Amstrad side, or is it destroyed for good and, will it in turn destroys a PC when plugged into a serial DE-9, and is there a safe way to test this

For the record, you can also read my thread on the same topic on 6502.org: http://forum.6502.org/viewtopic.php?f=4&t=8252

Statistics: Posted by Louis.m — Wed Jan 29, 2025 2:57 am

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